<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      let a = 'length'
      const obj = {
        name: 'zs',
        ['xxx']: 123,
        [9]: 123,
        [a]: 3,
      }
      //   obj.name
      //   obj['name']
      console.log(obj)
    </script>
  </body>
</html>
